[rschumann]

💡 What: Added sync.Pool for bytes.Buffer in the HTTP response writer middleware.
🎯 Why: To eliminate per-request buffer allocations for non-streaming responses, reducing GC pressure and latency in the hot path.
📊 Impact: Expected to significantly reduce memory allocations during high-throughput non-streaming API traffic. Includes a 128KB capacity limit to prevent memory bloat.
🔬 Measurement: Verified via unit tests. Expected reduced allocations per operation (allocs/op) in production.

---

PR created automatically by Jules for task 8377094510951328697 started by @rschumann

[google-labs-jules]

👋 Jules, reporting for duty! I'm here to lend a hand with this pull request.

When you start a review, I'll add a 👀 emoji to each comment to let you know I've read it. I'll focus on feedback directed at me and will do my best to stay out of conversations between you and other bots or reviewers to keep the noise down.

I'll push a commit with your requested changes shortly after. Please note there might be a delay between these steps, but rest assured I'm on the job!

For more direct control, you can switch me to Reactive Mode. When this mode is on, I will only act on comments where you specifically mention me with @jules. You can find this option in the Pull Request section of your global Jules UI settings. You can always switch back!

New to Jules? Learn more at jules.google/docs.

---

For security, I will only act on instructions from the user who triggered this task.